The YYCFG two-component signal transduction system (TCSTS) has been shown to be essential to the viability of several gram-positive bacteria. However, the function of the gene pair remains unknown. Interestingly, while both components are essential to Staphylococcus aureus and Bacillus subtilis, only the response regulator (YYCF) is essential to Streptococcus pneumoniae.
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